In an article, Paul Rotter (aka the Flipper) mentions that if one wants to become a good trader, they need to "spend a lot of time watching the order book." Forgive my ignorance, but what is this order book? How can one watch this? Thanks for any help!
Not just for scalping. Have a look at the last chart on the page here http://www.elitetrader.com/vb/showthread.php?s=&threadid=78980&perpage=6&pagenumber=20 and the first one on the next page.